Move bionic_macros.h from private to platform.

Test: treehugger
Change-Id: Ie473914f4c8924c7240b3ac22093a9daf42fc948
diff --git a/libc/bionic/bionic_elf_tls.cpp b/libc/bionic/bionic_elf_tls.cpp
index 3fa5182..61d826c 100644
--- a/libc/bionic/bionic_elf_tls.cpp
+++ b/libc/bionic/bionic_elf_tls.cpp
@@ -36,7 +36,7 @@
 #include "private/ScopedRWLock.h"
 #include "private/ScopedSignalBlocker.h"
 #include "private/bionic_globals.h"
-#include "private/bionic_macros.h"
+#include "platform/bionic/macros.h"
 #include "private/bionic_tls.h"
 #include "pthread_internal.h"